Re: PARI/GP pthread questions

["Ruud H.G. van Tol" <rvtol@isolution.nl>]

On 2023-12-03 16:05, Ruud H.G. van Tol wrote:
> On 2023-12-03 15:31, Bill Allombert wrote:
> > On Sun, Dec 03, 2023 at 03:09:49PM +0100, Karim Belabas wrote:
> > [...]
> > > For systems with hyper-threading, one can get the number of physical 
> > > cores
> > > as follows on my laptop:
> > >
> > > # grep '^cpu cores' /proc/cpuinfo | uniq
> > > cpu cores    : 4
> > This is only work if you have a single CPU!
>
> $ grep '^physical id[^:]*:' /proc/cpuinfo |sort |uniq |wc -l
> 2
>
> $ grep '^core id[^:]*:' /proc/cpuinfo |sort |uniq |wc -l
> 8
>
> $ grep '^processor[^:]*:' /proc/cpuinfo |wc -l
> 32
>
> $ grep '^cpu cores[^:]*:' /proc/cpuinfo |sort |uniq -c
>      32 cpu cores       : 8

$ lscpu | grep -E '^(Thread|Core|Socket|CPU)[(]'
CPU(s):                32
Thread(s) per core:    2
Core(s) per socket:    8
Socket(s):             2


Then see also `numactl`.

-- Ruud